Impossible to answer without the serial number.
Blue Book of Gun Values. 2nd Generation Models were produced from 1956-1978 with serial number range of 0001SA-73000SA 3rd Generation Models were began in1978 with serial number range of 80,000SA-99,999SA IN 1978. at this point the "SA" suffix changed to a prefix beginning with SA01001- SA99,999 during 1993, and began over, this time separating the letters "SA, and starting with S02001A.
1st generation refers to date manufactured........... early colt SAA merely had a serial number. latter, as with 2d generation , colt placed a SA.....in front of serial number. then colt put the SA after the serial number. Current production puts the S before the serial number and the A after the serial number. Somewhat confusing..................First generation colt 1873 single action army pistols were made from 1873 until 1941. Early models were known as "pinched frame" models because of the single screw which held the cylinder pin in the frame. About 1891, this system was improved on when a side screw was added on the frame to replace the frame screw which was located in the front of the frame.
You will have to call Colt with the serial number to find out.
After 1978
about 1957
your colt single action was made in 1970.
Impossible to answer without the serial number.
Proofhouse.com has Colt sn tables. You can also call Colt and they will tell you.
about 1970
Can be any SA or DA, it's not a guessing game.
about 1875
Per proofhouse.com, the Colt single action army with that serial number was made sometime after 1978.